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  • 1.  100Gbps single mode Lane 0 down

    Posted 08-21-2023 11:36

    greetings Junos Guru's

    I was wondering if you could assist me?

    I have 2 x 4650 ex (VC) switches on the latest firmware connected via single mode fibre. 

    The connection was stable for 4 days with the FEC disabled on both sides but has suddenly dropped and not come back

    I have checked the  laser rx/rx and all looks ok

    the qsfp28 is a QSFP28-BIDI-LR (single lane)

    any advice for where i can start to tackle this issue?

    thanks 

    Richard  



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    RICHARD THOMPSON
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  • 2.  RE: 100Gbps single mode Lane 0 down

    Posted 08-21-2023 11:44

    Could you share the output for these test commands on the two linked interfaces.

    show interface terse

    show interfaces diagnostics optics



    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
    ------------------------------



  • 3.  RE: 100Gbps single mode Lane 0 down

    Posted 08-22-2023 11:12

    Hi spuluka,

    Many thanks for you response 

    Please see below for output from requested commands

    Switch1

    et-0/0/50               up    down
    et-0/0/50.0             up    down eth-switch

    show interfaces diagnostics optics et-0/0/50
    Physical interface: et-0/0/50
        Module temperature                        :  35 degrees C / 95 degrees F
        Module voltage                            :  3.2670 V
        Module temperature high alarm             :  Off
        Module temperature low alarm              :  Off
        Module temperature high warning           :  Off
        Module temperature low warning            :  Off
        Module voltage high alarm                 :  Off
        Module voltage low alarm                  :  Off
        Module voltage high warning               :  Off
        Module voltage low warning                :  Off
        Module temperature high alarm threshold   :  78 degrees C / 172 degrees F
        Module temperature low alarm threshold    :  -8 degrees C / 18 degrees F
        Module temperature high warning threshold :  73 degrees C / 163 degrees F
        Module temperature low warning threshold  :  -3 degrees C / 27 degrees F
        Module voltage high alarm threshold       :  3.6300 V
        Module voltage low alarm threshold        :  2.9700 V
        Module voltage high warning threshold     :  3.4640 V
        Module voltage low warning threshold      :  3.1340 V
        Laser bias current high alarm threshold   :  129.999 mA
        Laser bias current low alarm threshold    :  9.999 mA
        Laser bias current high warning threshold :  124.999 mA
        Laser bias current low warning threshold  :  14.999 mA
        Laser output power high alarm threshold   :  6.5464 mW / 8.16 dBm
        Laser output power low alarm threshold    :  0.6026 mW / -2.20 dBm
        Laser output power high warning threshold :  5.7544 mW / 7.60 dBm
        Laser output power low warning threshold  :  0.7586 mW / -1.20 dBm
        Laser rx power high alarm threshold       :  6.5464 mW / 8.16 dBm
        Laser rx power low alarm threshold        :  0.0562 mW / -12.50 dBm
        Laser rx power high warning threshold     :  6.4565 mW / 8.10 dBm
        Laser rx power low warning threshold      :  0.0708 mW / -11.50 dBm
        Laser temperature high alarm threshold    :  0 degrees C / 32 degrees F
        Laser temperature low alarm threshold     :  0 degrees C / 32 degrees F
        Laser temperature high warning threshold  :  0 degrees C / 32 degrees F
        Laser temperature low warning threshold   :  0 degrees C / 32 degrees F
      Lane 0
        Laser bias current                        :  102.804 mA
        Laser output power                        :  2.731 mW / 4.36 dBm
        Laser receiver power                      :  0.747 mW / -1.27 dBm
        Laser bias current high alarm             :  Off
        Laser bias current low alarm              :  Off
        Laser bias current high warning           :  Off
        Laser bias current low warning            :  Off
        Laser receiver power high alarm           :  Off
        Laser receiver power low alarm            :  Off
        Laser receiver power high warning         :  Off
        Laser receiver power low warning          :  Off
        Tx loss of signal functionality alarm     :  Off
        Rx loss of signal alarm                   :  Off
        Tx laser disabled alarm                   :  Off

    Switch 2

    et-0/0/50               up    down
    et-0/0/50.0             up    down eth-switch

    show interfaces diagnostics optics et-0/0/50
    Physical interface: et-0/0/50
        Module temperature                        :  31 degrees C / 87 degrees F
        Module voltage                            :  3.2800 V
        Module temperature high alarm             :  Off
        Module temperature low alarm              :  Off
        Module temperature high warning           :  Off
        Module temperature low warning            :  Off
        Module voltage high alarm                 :  Off
        Module voltage low alarm                  :  Off
        Module voltage high warning               :  Off
        Module voltage low warning                :  Off
        Module temperature high alarm threshold   :  78 degrees C / 172 degrees F
        Module temperature low alarm threshold    :  -8 degrees C / 18 degrees F
        Module temperature high warning threshold :  73 degrees C / 163 degrees F
        Module temperature low warning threshold  :  -3 degrees C / 27 degrees F
        Module voltage high alarm threshold       :  3.6300 V
        Module voltage low alarm threshold        :  2.9700 V
        Module voltage high warning threshold     :  3.4640 V
        Module voltage low warning threshold      :  3.1340 V
        Laser bias current high alarm threshold   :  129.999 mA
        Laser bias current low alarm threshold    :  9.999 mA
        Laser bias current high warning threshold :  124.999 mA
        Laser bias current low warning threshold  :  14.999 mA
        Laser output power high alarm threshold   :  6.5464 mW / 8.16 dBm
        Laser output power low alarm threshold    :  0.6026 mW / -2.20 dBm
        Laser output power high warning threshold :  5.7544 mW / 7.60 dBm
        Laser output power low warning threshold  :  0.7586 mW / -1.20 dBm
        Laser rx power high alarm threshold       :  6.5464 mW / 8.16 dBm
        Laser rx power low alarm threshold        :  0.0562 mW / -12.50 dBm
        Laser rx power high warning threshold     :  6.4565 mW / 8.10 dBm
        Laser rx power low warning threshold      :  0.0708 mW / -11.50 dBm
        Laser temperature high alarm threshold    :  0 degrees C / 32 degrees F
        Laser temperature low alarm threshold     :  0 degrees C / 32 degrees F
        Laser temperature high warning threshold  :  0 degrees C / 32 degrees F
        Laser temperature low warning threshold   :  0 degrees C / 32 degrees F
      Lane 0
        Laser bias current                        :  107.335 mA
        Laser output power                        :  2.061 mW / 3.14 dBm
        Laser receiver power                      :  0.822 mW / -0.85 dBm
        Laser bias current high alarm             :  Off
        Laser bias current low alarm              :  Off
        Laser bias current high warning           :  Off
        Laser bias current low warning            :  Off
        Laser receiver power high alarm           :  Off
        Laser receiver power low alarm            :  Off
        Laser receiver power high warning         :  Off
        Laser receiver power low warning          :  Off
        Tx loss of signal functionality alarm     :  Off
        Rx loss of signal alarm                   :  Off
        Tx laser disabled alarm                   :  Off

    Kind regards

    Richard



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    RICHARD THOMPSON
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